![]() ![]() M3, MX5, S2000, 330's were the main cars I were looking at at the time. Not long after returning from Spa Francorchamps from two days on track there in the Easter 2018 I started looking at what I could change the car to. This is a car I used on the road and track days for 2.5 years, it was a fantastic car to learn to drive in and start of doing track days in but after that time I had become a little bored of it, I had bought and built a Megane turbo engine top go into it but before dropping it in I changed my mind and I decided I wanted to stay NA and build a different sort of car, something new which was going to be a new challenge and would require me to learn a lot more about driving, inevitably it had to be RWD. Safety devices R020 Cage – Double Rear Cross Gaz Gold adjustable Dampers 600F/350R Linear springs Solid Lower Engine mount with custom PU Bushes. and the engine is spinning much faster than at idle.Clio 2.0 F4R – 201.5 BHP 165 FTLB mapped at EFI TuningĤ.73 Shorter final drive (137mph 7750RPM)īraided Clutch line – Solid to chassis leg – Braid from leg to box slave. especially on these fancy new efi systems with intake air control and fuel cut on decel. ![]() The highest manifold vacuum is actually when compression braking. this vacuum is completely separate to the venturi itself, which sees a pressure differential between its narrowest point and the surrounding larger duct (whether this is referenced to atmospheric pressure or not) simply due to air flowing through it having the higher velocity. The manifold pressure shows the position of the throttle plate and how its governing air flow into engine, and therefore the power the engine will produce, the pressure differential being equal to the square of the airflow. The atmosphere then pushes fuel into the venturi/throttle body through the jet into this low area zone - The spray gun principle. the same density or mass of air flowing through a smaller duct has higher velocity, therefore lower pressure. the same volume of air passes through the narrow venturi, as flows through the large manifold.Īs per bernoullis theorem, velocity, pressure and density are all interchangeable. The converging shape of the venturi causes that air to speed up. ![]() The same air flowing through the manifold flows through the throttle body, governed by the throttle plate. Manifold - a tube connecting throttle body to cylinder. the throttle plate controls the diameter of the venturi. Throttle Body - a duct with a converging diverging throat. Throttle plate - a variable valve to restrict air flow. As the motor comes up to operating temperature, the choke is opened so the normal amount of fuel is mixed with the air. Fuel does not fully vaporize when the motor is cold and it will not burn if not vaporized, so the extra fuel makes enough vapor for the motor to run. Closing the choke adds manifold vacuum to venturi vacuum to pull more fuel into the intake. More fuel without more air or vice versa would cause the engine to quit.Īlso shown is the choke plate, which is used to get extra fuel into a motor before it is up to operating temperature. The ratio of gasoline to air must remain approximately 14:1 in order to burn properly, so as airflow increases through the venturi vacuum in the throat also increases, pulling enough more fuel to keep the ratio correct. It also contains a venturi which meters the amount of fuel mixed into the air. Pressure does not increase because more power is being made, rather, more power is made because opening the throttle (increasing pressure or reducing vacuum) allows the engine to pump and burn more fuel/air mixture.Ī carburetor contains the throttle for controlling airflow into the engine. ![]() Manifold pressure controls power production and the throttle controls manifold pressure. ![]()
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